We report here a case of strangulation of the penis. A 69-year-old male visited our hospital suffering from a swollen penis and dysuria after installation of four metallic washers to the penis. He had mischievously put them on his penis four days before and subsequently was unable to remove them. We found erosion on the surface of the penis, reduction in blood flow by ultrasonography, and high C-reactive protein levels. Because we could not remove washers by blood removal from glans penis or ring cutter, we performed percutaneous cystostomy and then cut the washers with an electric grinder under general anesthesia. The operation took 2 hours and 25 minutes. The postoperative course was uneventful. Neither disturbance of blood flow nor urethral stricture was found. He completely recovered without erectile dysfunction or difficult urination 7 months after the operation. Management of this rare condition is discussed.